Machine fob making shovel-handles



RUSSELL D. BARTLETT, OF BANGOR, `MAINE.

MACHINE FOR MAKING SHOVL-HANDLES.

Specication of Lettersk Patent No. 10,631, dated March .14, 1854.

To all whom t may con dem:

j Be it known that I, RUSSELL D. BARTLETT, of Bangor, in the county ofPenobscot and State of Maine, have invented new and useful Improvementsin Machinery for Manufacturing the Hand Part or Head of 1Shovel-Handles; and I do hereby declare that the same are fullydescribed andrepresented in the following specification and theaccompanying drawings, letters, figures, and

references thereof. f

Of the said drawings, Figure l, denotes a' top view of the mechanismconstituting my invention or machine for manufacturing the head or handparts of a shovel handle. Fig,

2, is a front elevation of the same. Fig. 3,

i is a transverse section taken longitudinally through-the shovel handlewhen in the position for the correct operation of the first one of thetwo vertical and movable cutters. Fig. l denotes a top view, and Fig. 5,a side view of a shovel handle. TheD or head part (or that part A, whichis united to the shank B) is made with a concave curve in a longitudinaldirection from a, to b, and with a convex curve in a transversedirection or from c, to d. It is also vmade with an opening E for thereception of the hand Vof a person. That part whichisgrasped by the-handis rounded 0E by my machine in two directions as seen at g, t, i, inFig. 4

' and' b, e, f, in Fig. 5. The underside of the head A, is made a planesurface,fthe same being formed by holding or applying itkon a rest C,and against the face of a rotary disk D, that is provided with cuttersE, E. vIn order tocorrectly form the upper curved surface of the head A,I make use of a dishedwheel F, a'vertical section of which is shown inFig. 6, as taken in line of its axis. This dished wheel consists of aflat disk c, or its equivalent united to a projecting rim or anch, cZ,which is circular` in section taken in any plane which is perpen- 45dicular to its shaftfe, while it is curved to a larger radius from whereit joins the disk to its opposite edge, the curve "being shown at g, h,and g l1. in Figs. 2 and' 6. This dished wheel is provided with one ormore 0 cutters z', each of which extends through a throat 7a, (madethrough the rim of `the wheel) and has its cutting edge `projectinginward from the inside surface ofthe rim.

y The cutter is shaped so as to form the curve a b, seen in Fig. 5. Eachcutter is so applied to the wheel, and there may be such a number ofthem as circumstances may re- Qquire. In `tothe wheel, a rest lGr,projects from a standard H. This rest consists of a shelf Z, and abearer plate m, raised on and vertically above the said shelf. Ahorizontal ,sectionof the wheel F, taken just above the shelf andshowing the mode of applyingthe `shovel handle, is given in Fig. 7

In vthe process of forming the curved surf face of the head A, such headis passed into l the wheel, and with its plane surface resting againstthe bearer m, while the head is sup- The cutter wheel Y ported on theshelf l. being in motion in the direction as denoted by thearrow n, theshovel handle is gradually turned horizontally from the position seen atI, into that represented by dotted lines at K. In so doing it will becut` down or curved in two directions, thatis both lone gitudinallyandtransversely, as -hereinbefore described. The bearer of the krest is soplaced with respect to the rim, that sustains the cutters, that itsinner edge or end shall' .be at a distance from the rim equal to-or avrlittle greater than the distance from b to f 'of F ig. 5, or in kotherwords, the greatest thickness of the head. This will enable the head tobe turned or moved under the operation of the cutters so as toimpart't'o it the required form on its curved surface.

.The wheel is rotated by a band made to op#V erate a pulley L, fixedont-he shaft of the .wheel After theV handle has been Vthus treated, itisl placed on a bed, M,and between the jaws N, N, of a holder, O, thatis fixed on the top of a vertical tubular shaft f y i' P, the positionof the handle being shown at Q, in the drawings. Y v .VVithin' the shaftP, there isa vertical shaft R, that is supported onv and connected to across bar S, that extends between and. is jointed t-o two treadles T, T,one of which,"`

viz, T, is so applied as to enable a person to raise the shaft R, by thedownward presi sure of his foot on the longer arm of said lever. Theother lever is'so applied as to enable him to depress the shaft R, bypress-` ing down the longer armof said'lever. `A

fork U, formed as seen inside view in Fig.

8, is attached to the upper part of the shaft R, and is moved with andby such shaft;

Its prongs n", a, incline toward one anothery I as they proceedupward,and they respectively pass through two corresponding ori`V fices 0, o',formed through the jaws N, N. These jaws turn horizontally on fulcra o rpins at p', p', extending up from a head g', fixed on the shaft P. Whent-he shaft R, is raised upward, thejaws of theholder will be openedapart ready to receive a shovel handle. /Vhen the shaft R, is depressed,these jaws close upon and firmly hold or grasp the handle. j

Above the holder, and in front of it, are arranged two sets of cut-ters,as seen at V, WV. They are affixed `to a Y shaped frame X, that is madeto siide freely up or down between guides Y, Y. Each set of cutters iscomposed of a gouge o, anda chisel p, the bevel of the cutting edges ofeach of which is formed on its inside surface. The gouge is of asemicircular or semielliptic shape in horizontal section, while thechisel is straight or slightly curved in such section of it. The.purpose of such is to cut out the opening E, of the head partof thehandle. By employ ing two such cutting tools together the process ofsharpening them` may be vmore easily effected than if they wereconnected in one piece. They are confined to the bar g, of the frame X,by a screw clamp r. Such frame X, has a friction-roller s, extended intothe groove y, of a cam Z, the form of ,j

such cam when developed on a plane surface being given in Fig. 9. Thiscam issupported on and fastened to a gear A', which in its turn rests onthe tops of two blocks C', M1, and is rotated by means of aiworm orendless screw D', that is fixed; on a driving shaft E2. One journal ofthis shaft works in a shifting lever F', whilethe other is so supportedin a stationary box Gr', as to enable the shaft to be moved by theshifting lever in such way as to carry the screw D', either into or outof engagement with the gear A'.

Besides the cutters which form the hole E' one set of which is intendedto remove nearly the whole of the wood necessary therefor, while theother set is for finishing the hole, or taking away the remaindernecessary to be removed) there is another curved cutter H'afxed to thebarg, of the frame X, the purpose of such cutter gouge H', being toremove the surplus wood from the end of the head A, so as to form thecurve g L z', as seen in Fig. 4L, such curve being the arc of a circle,whose center is in the axis of the shaft R. There are other cutters asseen at I', K', the same being arranged so as to produce the curve b ef, (in Fig. 5) of the extreme end of the head A. For this purpose theyare so placed in the circular path of horizontal movement of the shovelhandle as to cut such handle away after the othercutters have performedtheir oilices. The first cutter (I') is a roughing cutter,

` while the second one (K') is a finisher.

In the operation of the machine, the shovel handle, held by thevholder,is made to rest stationary on the bed M, not only while the frame X,descends and forces the set` of cutj ters V, down through thehead of thehandle,

,stationary during the depression and eleva-v but while the frame X, isbeing elevated so as to carry the said cutters out of and above thehandle. This done, the holder is turned through the sector of a circleso as to carry the head of, the handle-.directly under the cutters WV,and H', and such holder is kept tion of such cutters, Whichnext takesplace. ,'On the accomplishment ofthelatter opera- :tion the holder ismoved through another sector of a circle suiiicient to carry the handlesuccessively in contact with and by 1' operates. The arm L', carries aslidingbolt iN', which at its rear end rests against a ,spring O'.

On this spring bolt there is a cam P', which is formed of an inclinedpassage a', a shoulder and a cam projection c', shaped as seen in topview in Fig. l0, and 1n side view 1n Fig. 11, which 1s a side view j ofthe arm. When the holder is in a proper 5 position for the operation ofthe set of cutjters V, to t-ake place, the spring bolt N', is pressedint-o a notch or recess d', of the block M', such notch or recessserving to maintain L the-position of the holder during the descent andascent of the set of cutters V.` As soon as such movements of the,cutters V have taken place, a stud e', that projects down from the gearwheel A', is carried against the part c', of the cam P', and so as tomove j the spring bolt backward out of the recess ci'. Next the studduring its further movement bears against the shoulder and pushesthe'spring bolt against a cam projection f', of

the block M'. This cam f', causes a further backward movement of thespring l bolts, sufIicient to enable the stud to enter the groove a',and bear against the side 71,', of it. Next the stud by its pressureagainst the part, 71,', moves the arm L', still further until the springbolt passes into another recess g', in the block M' the stud in the'meantime `passing through the groove a', in Vconse-` quence of theforward motion of the spring bolt in passing from the'cam f', into therecess g'. This last recess g' receives the spring bolt and maintainsthe stationary position of thevholder during the time the cutters 1V,are depressed and elevated. As soon as their elevation has taken place,another stud h" (projecting down from the gear wheel A', see Fig. 12,which is an underside view of the gear wheel A', and its studs c" andz",) is carried into contact with the cam c', so as to move thespringbolt back out of the recess g', andiby its pressure against the shoulderb' move the arm L',

so as to carry the holder around not only far enough for it to cause thecutters I, K, to perform their offices, but against a cam d', formed onthe inner side of thev block C', and so made as to force back the springbolt far enough to permit the stud to pass through the groove a, andclear itself from the spring bolt. On the accomplishment of al] this theshovel handle is to be removed from the holder and another one put inits place and the holder turned around, so as to again bring the springbolt into the recess d.

Having thus described my invention, I claiml. rIhe combination andarrangement of the bed M, the rotary holder O, one or more verticalmovable cutters VNV, H, and one or more stationary cutters I, K', asmade to operate together and form the D, or head part of the shovelhandle substantially as speciiied.

2. And I claim the combination of the curved knife, o, andthe arc knife,p, so ap- 'I plied'together as not only to allow them to' i 3. AndIclaim the combination applied l to the shaft of the rotary holder andgear wheel A, for th'e purpose of operating the holder as specified, thesaid combination consisting of the cam'V blocks, C, M,pthe armrL, thespring bolt` N', its cam P', and the two studs, e', and h", the wholebeing constructed and made to operate together substantially asspecified. y

In' testimony whereof, I have hereto set my signature this sixteenth dayvof August, A. D. 1853.

RUSSELL D. BARTLETT.

Witnesses:

R. I-I. EDDY, F. P. HALE, Jr.

